/*
 * Copyright 2011 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.inftel.tms.mobile.util;

import org.inftel.tms.mobile.TmsConstants;
import org.inftel.tms.mobile.util.base.LocationUpdateRequester;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.location.Criteria;
import android.location.LocationManager;
import android.util.Log;

/**
 * Provides support for initiating active and passive location updates for all
 * Android platforms from Android 1.6. Uses broadcast Intents to notify the app
 * of location changes.
 */
public class LegacyLocationUpdateRequester extends LocationUpdateRequester {

    protected AlarmManager alarmManager;

    protected LegacyLocationUpdateRequester(LocationManager locationManager,
            AlarmManager alarmManager) {
        super(locationManager);
        this.alarmManager = alarmManager;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void requestLocationUpdates(long minTime, long minDistance, Criteria criteria,
            PendingIntent pendingIntent) {
        Log.d("LocationUpdateRequester", "Legacy subscription.");
        /*
         * Prior to Gingerbread we needed to find the best provider manually.
         * Note that we aren't monitoring this provider to check if it becomes
         * disabled - this is handled by the calling Activity.
         */
        String provider = locationManager.getBestProvider(criteria, true);
        if (provider != null) {
            locationManager.requestLocationUpdates(provider, minTime, minDistance, pendingIntent);
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void requestPassiveLocationUpdates(long minTime, long minDistance,
            PendingIntent pendingIntent) {
        /*
         * Pre-Froyo there was no Passive Location Provider, so instead we will
         * set an inexact repeating, non-waking alarm that will trigger once the
         * minimum time between passive updates has expired. This is potentially
         * more expensive than simple passive alarms, however the Receiver will
         * ensure we've transitioned beyond the minimum time and distance before
         * initiating a background nearby loction update.
         */
        alarmManager.setInexactRepeating(AlarmManager.ELAPSED_REALTIME, System.currentTimeMillis()
                + TmsConstants.MAX_TIME, TmsConstants.MAX_TIME, pendingIntent);
    }
}
